Engine Controls - Pin Voltage Charts: Introduction

Pin voltage (value) charts are used for diagnosing intermittent symptoms and faults that are unable to be resolved during self-diagnostics. Pin tests ensure the Powertrain Control Module is receiving and transmitting proper voltage and other signals.

Parameter Identification (PID) values also check PCM input and output signals. PID values are retrieved using an OBD-II compliant scan tester. PID values can only be accessed on OBD-II models. See PID TESTING  under TEST PROCEDURES.

Before performing tests, ensure mechanical conditions have been inspected and self-diagnostics has been attempted. Service bulletins may also be helpful in correcting a hard to diagnose problem.